Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The advent of December brings a slight shift in average high-temperature, moving from a chilly 46.8°F (8.2°C) in November to an icy 38.3°F (3.5°C). McHenry records an average nighttime low of 26.4°F (-3.1°C) in December.Humidity
In McHenry, the average relative humidity in December is 85%.Rainfall
In McHenry, in December, it is raining for 8.1 days, with typically 2.4" (61mm) of accumulated precipitation. Throughout the year, there are 166.5 rainfall days, and 30.79" (782mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. In McHenry, Maryland, in December, during 9.1 snowfall days, 5.24" (133mm) of snow is typically accumulated. Throughout the year, in McHenry, there are 48.4 snowfall days, and 26.69" (678mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 9h and 24min of daylight.On the first day of December, sunrise is at 7:19 am and sunset at 4:53 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 5:03 pm EST.
Sunshine
In December, the average sunshine is 3.6h.UV index
With an average maximum UV index of 1, December is the month with the lowest UV index. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index of 1 during December leads to these instructions:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Be advised! The UV radiation from the Sun can be almost doubled due to the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How cold does it get in December?
What is the average humidity in December?
How much does it rain in December?
How many days does it snow in December?
What is the month with the shortest days?
How many hours of daylight does McHenry have in December?
When is the sunrise / sunset in December?
How many hours of sunshine does McHenry have in December?
When is the lowest UV index?
What is the UV index intensity in December?
Average temperature in December
McHenry, MD
- Average high temperature in December: 38.3°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (32°F).
- Average low temperature in December: 26.4°F
The month with the highest average low temperature is July (58.8°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).
Average pressure in December
McHenry, MD
- Average pressure in December: 30.11"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in December
McHenry, MD
- Average wind speed in December: 8.4mph
The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
McHenry, MD
- Average humidity in December: 85%
The month with the highest relative humidity is February (87%).
The months with the lowest relative humidity are April, June, July and August (79%).
Average rainfall in December
McHenry, MD
- Average rainfall in December: 2.4"
The wettest month (with the highest rainfall) is May (3.43").
The driest month (with the least rainfall) is November (1.85").
Average rainfall days in December
McHenry, MD
- Average rainfall days in December: 8.1 days
The month with the highest number of rainy days is May (20.9 days).
The month with the least rainy days is February (7.3 days).
Average snowfall in December
McHenry, MD
- Average snowfall in December: 5.24"
The month with the highest snowfall is February (5.28").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
McHenry, MD
- Average snowfall days in December: 9.1 days
The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
McHenry, MD
- Average daylight in December: 9h and 2min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in December: 3h and 4min
The month with the most sunshine is August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 6min).
Average sunshine days in December
McHenry, MD
- Average sunshine days in December: 15.5 days
The month with the most sunshine days is November (16.5 days).
The month with the least sunshine days is May (8.3 days).
Average UV index in December
McHenry, MD
- Average UV index in December: 1
The months with the highest UV index are May, June, July and August (UV index 5).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
McHenry, MD
- Average cloud cover in December: 65
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is August (Cloud cover 40).
Average visibility in December
McHenry, MD
- Average visibility in December: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, October, November and December (5mi).
The month with the lowest visibility is September (4mi).
McHenry, Maryland, USA
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